Thermit mixture



Patented Oct. 3, 1922 UNITED STATES GLENN WALTER HEMEFIELD, OF JOHN'STOWN, PENNSYLVANIA.

THEBMIT MIXTURE.

Io Drawing.

' To all whom it may concern: Be it known that I, GLENN WALTER Man- REFIEH), a citizen of the United States, and resident of Johnstown, in the county of Cambria and State of Pennsylvania. have invented certain new and useful Improvements in Thermit Mixtures, of which the following is a specification.

My invention relates to thermit mixtures,

and more particularly relates to a thcrmit mixture for manganese steel.

The main object of my invention is ;to provide a new mixture of the class described, for 'welding manganese steel and repairing manganese steel castings, which when ignited will produce an alloy having a substantial manganese content to com-' pensate for the loss in operation.

' I have discovered that a mixture com-v posed of from 11 to 13 er cent of granulated aluminum, which is sufficiently fine to pass through a 20 to 30 mesh screen.

70 to 72 per cent/of iron oxide, preferably in the form of mill scale, 10 to 12 per cent of low carbon steel. particles, preferably in the form of unchings, and 6 to 9 per cent of crushed erromanganese which is sufficiently fine to pass through a 10 mesh screen, will when properly'used form a perfeet weld with manganese steel and manganese steel castings.

The preferred and ideal mixture, composed of the above ingredients is, 12 per cent 'of aluminum, Tl per cent of iron oxide, 10 per cent of low carbon steel and 7 pler cent of ferromanganese.

. he iron oxide and low carbon steel while preferably used in the form of mill scale Application filed October 25, 1921. Serial Io. 510,372.

and punchings, respectively, of course, me.

be used in any desired form, although thli 40 mill scale and punchings are readily available to those in the art."

The advantages of my invention will be readily apparent to those skilled in the art.

By the inclusion of the ferroman anese H1 the'mixture a manganese alloy is ornied after the mixture has been i nited and the reaction completed, which allby has a great affinity for manganese steel.

Changes in proportions within the scope of the appended claims may be readily made by those skilled in the art.

1. A thermit mixture for manganese steel composed of 11 to 13'per cent of aluminum. to 72 per cent of iron oxide, 10 to 12 per cent of low carbon steel, and 6 to 9 per cent of ferromanaganese.

2. A thermitmixture for manganese steel composed of 12 per cent of aluminum, 71 6 per cent of iron oxide. 10 per cent of low -carbon steel, and I per cent of ferromam" GLENN WALTER MERREFIELD. 

